concept JG22Network is Swingable {
  JPanel panel = jpanelWithoutLayoutManager();
  new G22Network network;

  *(G22Network *network) {
    for (element : network.elements)
      visualizeElement(element);
  }
  
  void visualizeElement(G22NetworkElement element) {
    var box = jMinSize(400, 300, jcenteredlabel("Drag or resize me!"));
    setOpaqueBackground(Color.white, box);
    setBorder(box, BorderFactory.createLineBorder(Color.green, 10);
    onMouseDown(box, event -> {
      if (!mouseEventIsInBorder(event))
        new ComponentDragger(box, event);
    });
    
    new ComponentResizeDragger(box, box);
    var bounds = or(element.bounds, rect(50, 50, 400, 300));
    setBounds(box, bounds);
    addToContainer(panel, box);
  }
  
  void newElement {
    new G22NetworkElement element;
    network.elements.add(element);
    network.change();
    visualizeElement(element);
  }
  
  cachedVisual panel;
}